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Brad Stone
New member
Username: Bstone

Post Number: 9
Registered: 06-2004

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Votes: 0

Posted on Wednesday, April 13, 2005 - 11:57 pm:   

Jeff - After reading your post I gave Martec a call, and here's what they said: Seems the main thing is to get the right thrust for the engine at proper rpm's. Either the 14x14 or the 15x12 will accomplish this. They said they'd always prefer to go with more diameter, as it "grabs" a wider area of water, which promotes better gas mileage - that's the only difference they sighted. The mileage improvement between a 14 and a 15 would be marginal... between a 14 and a 16 would be more noticeable. They're preference on the 9.1 would be a 16x... but there's no room for that on our boats. The mileage on these diesels is pretty amazing in any event!

One of their "guidelines" (you probably went through this) is for a clearance of 15% of the prop diameter, between top of blade and hull. I figured this last year when I purchased, and I'm about there. They suggested that perhaps your prop shaft was a bit longer, giving you more room to the hull. They then said that the 15% was "a guideline," and that less clearance has been successful as well. All in all, sounds like six of one, half dozen of another. I had no problems for the short time I was out last year - I'll pay more attention to performance when I get out this year, and post.

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